Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope
Patent
1976-03-25
1977-06-14
Demeo, Palmer C.
Electric lamp and discharge devices
With temperature modifier
Double wall, jacket or casing for envelope
313184, 313229, 313487, H01J 6118, H01J 6134, H01J 6144
Patent
active
040299830
ABSTRACT:
The light output of a high-pressure metal-halide lamp that employs a sodium-scandium discharge and has an efficacy of approximately 90 lumens per watt is selectively modified by a luminescent coating on the inner surface of the outer envelope to provide color rendering and a source-color that are similar to those of an incandescent type lamp. The luminescent coating comprises a blend of two selected phosphor materials, one of which absorbs and is excited by blue-violet radiations produced by the arc discharge and emits in the green portion of the spectrum, and the other of which absorbs and is excited by the violet to yellow band of radiations produced by the arc discharge and emits in the red portion of the spectrum. The desired color rendering and reduction in the color temperature (from about 3600K to about 2800K) are achieved with a minimum drop in efficiency by using a luminescent coating consisting of approximately equal amounts (by weight) of green-emitting CaS:Ce phosphor and red-emitting CaS:Eu phosphor. Various other combinations of phosphors are also disclosed.
REFERENCES:
patent: 3821577 (1974-06-01), Larson
patent: 3825792 (1974-07-01), Rokosz et al.
patent: 3866083 (1975-02-01), Datta et al.
Buleza D. S.
DeMeo Palmer C.
Westinghouse Electric Corporation
LandOfFree
Metal-halide discharge lamp having a light output with incandesc does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Metal-halide discharge lamp having a light output with incandesc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Metal-halide discharge lamp having a light output with incandesc will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-12373